- Manuscripts, Hebrew2
- Manuscripts, Italian3
- Manuscripts, Latin3
- Manuscripts, Latin (Medieval and modern)18
- Manuscripts, Medieval15
- Manuscripts, Renaissance51
- Manuscripts, Scottish1
- Manuscripts, Turkish1
- Maps1
- Marbled paper bindings1
- Margaret, Queen, consort of James IV, King of Scotland, 1489-15411
- Mary, Queen of Scots, 1542-15872
- Massachusetts--Boston5
- Materia medica1
- Materia medica, Vegetable1
- Mathematics1
- Medicine5
- Medicine, Magic, mystic, and spagiric1
- Medicine--Formulae, receipts, prescriptions1
- Mediterranean Sea2